Texas is over 22 million (85% of which live in metropolitan areas) and not even close to having a state income tax. As I said, with increasing population density, comes more liberal thinking.
And if population growth from immigration does not cease, Texas will soon have an income tax.
This is only the beginning:
State Legislator (Texas) Proposes State Income Tax
Haha. 1 Democratic Senator proposing an income tax is Texas being close to that tax. Whatever. You really don't know very much about Texas.